Originally posted by BigMackCam I now habitually depress the lens release button in when attaching a lens
Yeah I started to do this basically after my first lens change. Coming from the Minolta Alpha mount back then the Pentax mount felt a lot less smooth to engage lenses on to.
Originally posted by BigMackCam Another possible cause is rough edges somewhere on the camera's lens mount
Unfortunately I had this problem on at least 2 different camera bodies that I can remember. And hadn't discovered the wonderful world of m42 yet..